K12RS v K12LT gearing

1961BMWR69S · Oct 5, 2012

I have a ?..... I have a 02 K12RS with a 33/12 rear drive. A guy in my motorcycle club gave to me a brand new rear drive unit from his 09 K12lt witch is a 34/13 ( he tricked it ). Would the LT be a lower gear or a higher gear then the RS gear.

Bobmws · Oct 5, 2012

33/12 = 2.75
34/13 = 2.62

The LT gearset will cruise at 60mph at a few lower RPM than the RS gearset. Your acceleration will be slightly slower.

pglaves · Oct 5, 2012

Bobmws said:
33/12 = 2.75
34/13 = 2.62

The LT gearset will cruise at 60mph at a few lower RPM than the RS gearset. Your acceleration will be slightly slower.

That is a 4.72% change in ratio. So whatever the stock gearing has the engine turning at any given speed will be reduced by 4.72% at any road speed, in the same gear.

So, for example, if with the original gearing the engine was turning at 4,000 it would be turning be turning at 3,811 with the new gearing

K12RS v K12LT gearing

1961BMWR69S

1960R100S

Bobmws

Curmudgeon At Large

pglaves

#13338

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